//
//  MainViewController.swift
//  微博
//
//  Created by 刘静 on 15/10/8.
//  Copyright © 2015年 liujing.cn. All rights reserved.
//

import UIKit

class MainViewController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        
        addChildViewControllers()
        // 此时 tabBarButton 还没有创建
        print(tabBar.subviews)
      
    
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        // 此时 tabBarButton 都已经创建
         setupComposedButton()
    }

   
func clickComposedButton(){
    
    print(__FUNCTION__)
    
}

    /// 设置撰写按钮位置

private func setupComposedButton(){
    
    let w = tabBar.bounds.width / CGFloat(viewControllers!.count)
    let rect = CGRect(x: 0, y: 0, width: w, height: tabBar.bounds.height)
    
    composeButton.frame = CGRectOffset(rect, 2 * w, 0)    }
    
    
    
    
///  添加所有的控制器
    private func addChildViewControllers(){
    
       addChildViewController(HomeTableViewController(),
        title:"首页",imageName:"tabbar_home")
        
       addChildViewController(MessageTableViewController(),title:"消息",imageName:"tabbar_message_center")
       
        addChildViewController(UIViewController())
        
        addChildViewController(DiscoverTableViewController(),title:"发现",imageName:"tabbar_discover")

    addChildViewController(ProfileTableViewController(),title:"我",imageName:"tabbar_profile")

        
    }
    
    
         ///  添加子控制器
    private func addChildViewController(vc: UIViewController,title: String,imageName: String) {
        
               
        //title 属性会从内向外传递设置
        vc.title = title
        vc.tabBarItem.image = UIImage(named: imageName)
        let nav = UINavigationController(rootViewController: vc)
        addChildViewController(nav)
        

    }
    
     //Mark: - 懒加载控件
    
    lazy private var composeButton: UIButton = {
    //自定义类型的按钮
        let button = UIButton()
        
        
        button.setImage(UIImage(named:"tabbar_compose_icon_add"), forState:UIControlState.Normal)
        button.setImage(UIImage(named:"tabbar_compose_icon_add_highted"), forState:UIControlState.Highlighted)
        
        button.setBackgroundImage(UIImage(named:"tabbar_compose_button"),forState:UIControlState.Normal)

        button.setBackgroundImage(UIImage(named:"tabbar_compose_button_highted"),forState:UIControlState.Highlighted)
 
           self.tabBar.addSubview(button)
        
        button.addTarget(self, action: "clickComposedButton", forControlEvents: UIControlEvents.TouchUpInside)
    return button
    
    }()
    
}
